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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a27c616d7b65d4d4763498c69ec14c113f109709d9f6ddc46b2e99aae5cf6f8' 
  AND token = 'MLrmsD6iaT526jE36T2kukTQRFPAD5IAXlbsbHJWR/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}